Do not set hostname of app container

Some apps like pasteboard try to curl the public app url from inside
the container. This fails because we set the hostname and the hostname
maps to the internal docker IP.

To fix this, simply export two environment variables providing the
app's domain and origin. The hostname is set to the app location instead
of the FQDN for debugging.

Fixes #521

src/docker.js

@@ -129,8 +129,10 @@ function createSubcontainer(app, cmd, callback) {
     var exposedPorts = {}, dockerPortBindings = { };
     var stdEnv = [
         'CLOUDRON=1',
-        'WEBADMIN_ORIGIN' + '=' + config.adminOrigin(),
-        'API_ORIGIN' + '=' + config.adminOrigin()
+        'WEBADMIN_ORIGIN=' + config.adminOrigin(),
+        'API_ORIGIN=' + config.adminOrigin(),
+        'APP_ORIGIN=https://' + config.appFqdn(app.location),
+        'APP_DOMAIN=' + config.appFqdn(app.location)
     ];
 
     // docker portBindings requires ports to be exposed
@@ -155,7 +157,8 @@ function createSubcontainer(app, cmd, callback) {
         if (error) return callback(new Error('Error getting addon environment : ' + error));
 
         var containerOptions = {
-            Hostname: config.appFqdn(app.location),
+            // do _not_ set hostname to app fqdn. doing so sets up the dns name to look up the internal docker ip. this makes curl from within container fail
+            Hostname: semver.gte(targetBoxVersion(app.manifest), '0.0.77') ? app.location : config.appFqdn(app.location),
             Tty: isAppContainer,
             Image: app.manifest.dockerImage,
             Cmd: cmd,